| Image Coa: | Wappen kirnitzschtal.PNG |
| Coordinates: | 50.9433°N 14.2467°W |
| State: | Sachsen |
| District: | Sächsische Schweiz-Osterzgebirge |
| Elevation: | 365 |
| Area: | 44.17 |
| Population: | 2083 |
| Stand: | 2011-12-31 |
| Postal Code: | 01855 |
| Area Code: | 035971 / 035022 |
| Licence: | PIR |
| Dissolved: | 1 October 2012 |
| Noautocat: | yes |
Kirnitzschtal is a former municipality in the Sächsische Schweiz-Osterzgebirge district, in Saxony, Germany. Since 1 October 2012, it is part of the town Sebnitz. It had its administrative seat in Lichtenhain.
The municipality was divided into the following 5 Ortsteile: